How do popcorn kernels pop and what type of corn kernel is it?

Not all corn kernels are equal. In order to pop, the kernel needs a water content of about 13.5 percent.

Each popcorn kernel consists of soft, moist starch inside a hard outer shell. When heat is applied, the moisture expands and the starch is cooked.

Eventually, the pressure gets so high that it bursts the outer shell with a loud pop!